All will power. Had my last cigarette on new years eve and haven't touched one since. Sometimes get the urge but been fighting it since and will continue to have no intention of starting back up. What spurs me on is when I box. Whenever I start gassing in my training I'd think to myself "FUCK I bet if I hadn't have been smoking would've done another round easy or would have more power left in my punches". I was on about 3-4 cigarettes (roll ups) a day not much by at all by most people's standards but that figure used to go to a stupid amount whenever I was drunk which was at least once a week.

All will power.